US3630372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grit chamber stirred by eductor tube enclosing vertically adjustable grit lift
Assignee: Chicago Bridge and Iron Co
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Filing: 1970-05-13
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Granted: 1971-12-28
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Expires: 1990-05-13
Abstract
Abstract In a grit chamber the rolling action which allows selective settling of grit is maintained by a centrally located draft tube actuated by air liberation near the bottom thereof. Grit accumulating at the bottom of a hopper concentric with the draft tube is removed by an airlift extending along the axis of the draft tube and having its bottom section vertically adjustable to compensate for varying grit depth.
Inventors
- 👤 Francis S Weir
- 👤 Douglas E Dreier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:50
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/24; B01D21/245; B01D21/0018; B01D21/0021; B01D21/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
In a grit removal chamber for removing grit from sewage flowing through the chamber, an eductor tube for setting up a rolling circulation of the contents of the chamber, an airlift grit removal pump extending along the axis of the eductor tube, projecting downwardly from the eductor tube and having a vertically shiftable foot for varying the proximity of the pump''s suction opening above the floor; an inverted bowl surrounding and substantially sealed to the pump in the lower portion of the eductor tube, said bowl having peripheral orifices for discharge of air to actuate the eductor tube, an air supply conduit leading into said bowl, and flexible strands for shifting the foot extending vertically through fairlead apertures of the bowl and rising therefrom to a common adjustment means.
Claim 2
Dependent Claim
129 words
In a grit removal chamber for removing grit from sewage flowing through the chamber, an eductor tube for setting up a rolling circulation of the contents of the chamber, an airlift grit removal pump extending along the axis of the eductor tube, projecting downwardly from the eductor tube and having a vertically shiftable foot for varying the proximity of the pump''s suction opening above the floor; an inverted bowl surrounding and substantially sealed to the pump in the lower portion of the eductor tube, said bowl having peripheral orifices for discharge of air to actuate the eductor tube, an air supply conduit leading into said bowl, and flexible strands for shifting the foot extending vertically through fairlead apertures of the bowl and rising therefrom to a common adjustment means.
Claim 3
Dependent Claim
152 words
Grit chamber apparatus including an eductor tube for circulating the liquid in the grit chamber; an airlift pump comprising a smaller tube extending along the axis of the eductor tube, means for liberating air within and near the bottom of the smaller tube, and a foot tube shiftable along said smaller tube for varying the height of the suction opening above the bottom of the chamber; an inverted bowl surrounding the smaller tube within the eductor tube substantially sealed to the smaller tube and spaced from the eductor tube to provide a flow passage therebetween, and having peripherally disposed orifices for discharging air into the lower portion of the eductor tube to cause circulation of sewage within the chamber; and means for adjusting the shiftable foot tube from above the eductor tube, said means including a pair of strands secured to the foot tube and extending through fair-lead apertures in the bowl.
Claim 4
Dependent Claim
152 words
Grit chamber apparatus including an eductor tube for circulating the liquid in the grit chamber; an airlift pump comprising a smaller tube extending along the axis of the eductor tube, means for liberating air within and near the bottom of the smaller tube, and a foot tube shiftable along said smaller tube for varying the height of the suction opening above the bottom of the chamber; an inverted bowl surrounding the smaller tube within the eductor tube substantially sealed to the smaller tube and spaced from the eductor tube to provide a flow passage therebetween, and having peripherally disposed orifices for discharging air into the lower portion of the eductor tube to cause circulation of sewage within the chamber; and means for adjusting the shiftable foot tube from above the eductor tube, said means including a pair of strands secured to the foot tube and extending through fair-lead apertures in the bowl.
Claim 5
Dependent Claim
132 words
Grit chamber apparatus including an eductor tube for circulating the liquor in the grit chamber; an airlift pump comprising a smaller tube extending along the axis of the eductor tube, means for liberating air within and near the bottom of the smaller tube, and a foot tube shiftable along said smaller tube for varying the height of the suction opening above the bottom of the chamber; an inverted bowl surrounding the smaller tube within the eductor tube substantially sealed to the smaller tube and spaced from the eductor tube to provide a flow passage therebetween, and having peripherally disposed orifices for discharging air into the lower portion of the eductor tube to cause circulation of sewage within the chamber; and means for adjusting the shiftable foot tube from above the eductor tube.
Claim 6
Dependent Claim
132 words
Grit chamber apparatus including an eductor tube for circulating the liquor in the grit chamber; an airlift pump comprising a smaller tube extending along the axis of the eductor tube, means for liberating air within and near the bottom of the smaller tube, and a foot tube shiftable along said smaller tube for varying the height of the suction opening above the bottom of the chamber; an inverted bowl surrounding the smaller tube within the eductor tube substantially sealed to the smaller tube and spaced from the eductor tube to provide a flow passage therebetween, and having peripherally disposed orifices for discharging air into the lower portion of the eductor tube to cause circulation of sewage within the chamber; and means for adjusting the shiftable foot tube from above the eductor tube.
Claim 7
Dependent Claim
95 words
Grit chamber apparatus including an eductor tube for circulating the liquor in the grit chamber; an airlift pump comprising a smaller tube extending along the axis of the eductor tube, means for liberating air within and near the bottom of the smaller tube, and a foot tube shiftable along said smaller tube for varying the height of the suction opening above the bottom of the chamber; means for liberating aIr within the eductor tube to cause circulation of sewage within the chamber; and means for adjusting the shiftable foot tube from above the eductor tube.
Claim 8
Dependent Claim
95 words
Grit chamber apparatus including an eductor tube for circulating the liquor in the grit chamber; an airlift pump comprising a smaller tube extending along the axis of the eductor tube, means for liberating air within and near the bottom of the smaller tube, and a foot tube shiftable along said smaller tube for varying the height of the suction opening above the bottom of the chamber; means for liberating aIr within the eductor tube to cause circulation of sewage within the chamber; and means for adjusting the shiftable foot tube from above the eductor tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |